THE NAUTILUS. 

 A NEW CHINESE SITALA. 



BY H. A. PILSBKT. 



Sitala hangchoivensis n. sp. Shell subperforate, trochiform with 

 rounded periphery, pale brown, surface dull, smoothish, under the 

 compound microscope showing dense, vertical striation, most distinct 

 on the penultimate whorl, and very fine, close spiral impressed lines, 

 the base distinctly striate spirally, with finer spirals in the intervals 

 between coarser lines. Spire conic with nearly straight outlines. 

 "Whorls 6, decidedly convex, the last rounded peripherally and convex 

 beneath. Aperture somewhat oblique, lunate, the margins thin and 

 simple ; columella concave below, vertical with reflexed edge above. 

 Alt. 3.7, diam. 4.1 mm. 



Hangchow, China. Types no. 91131 A. N. S. P., from no. 1074 

 of Mr. Hirase's collection. 



It is not easy to decide whether this species should be considered 

 a Sitala or a Kaliella, but on account of the fine spiral striation it 

 probably accords best with the first. It is larger than Kaliella de- 

 pressa and K. monticola Mlldff. with fewer whorls, 6 instead of 6^, 

 and it has a dull, not glossy surface. 



NEW SPECIES OF PISIDIUM. 



BY V. STERKI. 



PISIDIUM PROXIMUM, n. sp. Mussel of medium size, moderately 

 to rather well inflated, outlines oval without any projecting angles, 

 posterior margin slightly subtruncate in some specimens, beaks 

 somewhat posterior, rather broad to narrow, rounded, or their cen- 

 ters more or less flattened, with a ridge around the flattened area in 

 some specimens ; surface with irregular, fine to rather coarse striae 

 and several lines of growth, shining, color light yellowish-horn to 

 brownish ; shell opaque to subtransluceut, thin ; hinge slight, cardinal 

 teeth of various shapes ; ligament rather long. 



Long. 5.6 alt. 4.8, diam. 3.4 m. (Wash.) 



Long. 6 alt. 5 diam. 3.8 m. (B. C.) 



Long. 4.1 alt. 3.5, diam. 2.5 m. (B. C.) 



Habitat : Washington, British Columbia : Walla Walla sent by 

 B. Walker, a good number of specimens deep horn to brownish, 



